DocumentCode :
3283697
Title :
A tag-free solution to unobtrusive indoor tracking using wall-mounted ultrasonic transducers
Author :
Wan, Eric A. ; Paul, Anindya S.
Author_Institution :
Dept. of Biomed. Eng., Oregon Health & Sci. Univ. (OHSU), Beaverton, OR, USA
fYear :
2010
fDate :
15-17 Sept. 2010
Firstpage :
1
Lastpage :
10
Abstract :
Methods for indoor tracking typically require a person to carry some type of a body worn tag. A novel tag-free solution is presented that utilizes low cost wall-mounted ultrasonic transducers. The active ultrasonic transducers capture analog echoes, which are then digitized and analyzed in order to calculate the 1-D range of the moving person. The tracking algorithm utilizes a number of signal processing techniques including band-pass filtering, Hilbert transformation, and background subtraction to remove interference from other objects in the room. The range data from multiple sensors are treated as observations in a Bayesian framework using the sigma-point Kalman smoother (SPKS) to determine a person´s 2-D position and velocity. The SPKS also performs “self-calibration” or simultaneous localization and mapping (SLAM) to determine the location of the wall-mounted transducers. The indoor tracking accuracy of the tag-free system is better than 0.5 meters.
Keywords :
Hilbert transforms; Kalman filters; SLAM (robots); band-pass filters; indoor radio; radio tracking; sensor fusion; ultrasonic transducers; 2D position determination; 2D velocity determination; Bayesian framework; Hilbert transformation; analog echoes; background subtraction; band pass filtering; low cost wall mounted ultrasonic transducers; multiple sensors; sigma point Kalman smoother; signal processing techniques; simultaneous localization and mapping; tag free solution; unobtrusive indoor tracking algorithm; Acoustics; Kalman filters; Mathematical model; Predictive models; Sensors; Sonar measurements;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Indoor Positioning and Indoor Navigation (IPIN), 2010 International Conference on
Conference_Location :
Zurich
Print_ISBN :
978-1-4244-5862-2
Electronic_ISBN :
978-1-4244-5865-3
Type :
conf
DOI :
10.1109/IPIN.2010.5648178
Filename :
5648178
Link To Document :
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